The problem I see with this is, whether on a printed brochure or hosted on a web site, the image would have some level of being cooked, post processed, potentially resolution scaled, dynamic range mapped into the presentation medium. In other words, unless they provide the RAW format files downloaded directly from the camera, there is too much extra involved in bringing an image to presentation form that the camera becomes a small contributor. Then, what do you end up comparing ? Don't forget, you'd need the same lens too.
Just remember, no matter what camera you finally choose to buy, it will have failings and head aches that you'll have to surmount. So, select based on the functionality and capabilities that you know you need.
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As far as Professional, Prosumer, or Consumer/Mass Market equipment goes, who is making the claim ?
A manufacturer can say what ever they want about their "top of the line" equipment being utilized by professional career photographers, but what cameras do actual professional career photographers use ?
For example, the National Geographic book "The Ultimate Field Guide to Photography" Chapter 4 "A Camera Phone Travelogue" by
Robert Clark, wow a for real pro photographer, used a Sony Ericsson S710A cell phone's 1.5 MP camera !!!
Does this mean a cell phone camera is Pro grade or that here is an example of a photographer challenging himself with an obviously limited camera ?
It all comes down to successful photography is choosing a technology that provides what you need and transcending the headaches bundled with it.